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For example 16AV1, (this is the site number for the Marksville site in Avoyelles Parish. Depths are given as cm bs (centimeters below surface) or cm/ft/in bd (centimeters, feet, inches below datum). The lab number consists of the Lab Code (abbreviation associated with a radiocarbon dating lab, for example Beta Analytic = Beta) followed by a number.16 = state designation number, AV= parish abbreviation, 1= sequential number assigned to site with the parish. For a complete list of lab codes referred to in the database see is sometimes referred to as the raw age and represents the uncalibrated radiocarbon date.

The C-14 method cannot be used on material more than about 50,000 years old because of this short half-life.

They proved this by showing that C-14 dates of wooden artifacts with cartouches (dated royal names) did not agree.

The explanation was that the physicists had assumed that the amount of C-14 in the atmosphere had been constant, when in fact it had varied over time.

The solution came using dendrochronology (tree ring dating).

Since tree rings provide an annual calendar, and some trees live for thousands of years, by C-14 dating the rings themselves one could correct the radiocarbon dates and calibrate the differences. should refer to the year the method was recognized, 1950.